"Andrew Collins describes a simple fossil fuel free heating and cooling system for year-round growing in an ordinary garden greenhouse, with details of his designs, fans and plans!
Controlling temperature swings in small garden greenhouses is notoriously difficult. Greenhouses are liable to overheating in full sun and, of course, most will do little to keep out a hard frost. Among those who are not keen on using electric or gas heaters in greenhouses there has been a resurgence of interest in 'solar greenhouses' using various methods to trap the solar energy striking the greenhouse and release it at night. At its simplest, the heat storage medium consists of barrels of water, but in a garden greenhouse these can take up a large proportion of the growing space."
With so many materials out there - plastic sheet, old windows, old sliding doors.
Do you have a homemade greenhouse???
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